Monte Carlo evaluation of monolithic scintillator block detectors using silicon PMTs

The optimal pixel size of SiPMT arrays to read out monolithic 20×20×10 mm LSO scintillator block detectors has been studied. The influence of different SiPMT parameters on the achievable spatial resolution was compared. It was concluded that a SiPMT array with 3*3 mm pixel size, pitch 3.4 mm pixel, 30% detection efficiency, 100 m *100 m micro-cell size and crosstalk smaller than 20% is a good and realistic design that achieves better spatial and energy resolution than our current monolithic scintillator block readout based on Hamamatsu S8550 APD arrays.